Child safety seat and side impact protection mechanism thereof

ABSTRACT

The present disclosure discloses a child safety seat and a side impact protection mechanism thereof, the side impact protection mechanism is provided at a backrest of the child safety seat and includes a side impact protection block and a self-locking structure. The side impact protection block is movably fitted to the backrest and has a folding position in which the side impact protection block is inwardly folded in the backrest and an unfolding position in which the side impact protection block is outwardly unfolded from the backrest. The self-locking structure automatically moves to a position that blocks the side impact protection block in the unfolding position from switching to the folding position when the side impact protection block is switched from the folding position to the unfolding position, the self-locking structure is fitted to the side impact protection block or the backrest, and the backrest and the side impact protection block shields the self-locking structure to block a release operation of the self-locking structure by an operator, so that the side impact protection block cannot be inwardly folded into the backrest after the first use, thereby effectively preventing the side impact protection block from being accidentally folded during the side impact to provide a side impact protection effect.

RELATED APPLICATION

The present application claims the priority of Chinese PatentApplication No. 202011176299.8, filed on Oct. 28, 2020, with the titleof “CHILD SAFETY SEAT AND SIDE IMPACT PROTECTION MECHANISM THEREOF”, theentire content of which is incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a field of baby products, and moreparticularly to a child safety seat and a side impact protectionmechanism thereof.

BACKGROUND

It is well known that a child safety seat is a baby product speciallydeveloped by an enterprise for young children. By using a child safetyseat, it can effectively prevent a baby from being injured due to suddenbraking or collision of an automobile, thereby ensuring the safety ofthe baby in the automobile. Thus, the child safety seat is very popularamong people, which further increasing a popularity of the child safetyseat.

At present, for the child safety seat, side impact protection devicesare mounted on side wings of a backrest of the child safety seat, inorder to provide the child safety seat with a side impact protectionfunction.

In the existing side impact protection device, a side impact protectionblock is formed so as to can be unfolded or folded relative to the sidewings of the backrest. In addition, the side impact protection block inan unfolding position is locked by a releasable lock block, so as tomaintain the side impact protection block in the unfolding positionstable relative to the side wings of the backrest to provide protectionfrom side impact.

Although a release operation of the lock block can flexibly unfold theside impact protection block, the side impact protection block in theunfolding position may not provide side impact protection during theside impact due to an accidental operation of the lock block.

Therefore, it is necessary to provide a child safety seat and a sideimpact protection mechanism thereof in which a side impact protectionblock cannot be folded relative to the backrest after the side impactprotection block is unfolded relative to the backrest and used for thefirst time, so as to overcome the above-mentioned defects.

SUMMARY

It is an object of the present disclosure to provide a side impactprotection mechanism in which a side impact protection block cannot befolded relative to a backrest after the side impact protection block isunfolded relative to the backrest and used for the first time.

It is a further object of the present disclosure to provide a childsafety seat in which a side impact protection block cannot be foldedrelative to the backrest after the side impact protection block isunfolded relative to the backrest and used for the first time.

To achieve the above object, the technical solution of the presentdisclosure is to provide a side impact protection mechanism provided atthe backrest of the child safety seat and including a side impactprotection block and a self-locking structure. The side impactprotection block is movably fitted to the backrest and having a foldingposition in which the side impact protection block is inwardly folded inthe backrest and an unfolding position in which the side impactprotection block is outwardly unfolded from the backrest. Theself-locking structure is fitted to the side impact protection block orthe backrest, the self-locking structure automatically moves to aposition that blocks the side impact protection block in the unfoldingposition from switching to the folding position when the side impactprotection block is switched from the folding position to the unfoldingposition, and the backrest and the side impact protection block shieldsthe self-locking structure to block a release operation of theself-locking structure by an operator.

In an embodiment, the self-locking structure includes a self-lockingmember fitted to the backrest or the side impact protection block andbeing telescopically slidable, and a self-locking reset member providinga reset force for a telescopically slidable movement of the self-lockingmember, the self-locking reset member has a constant tendency to drivethe self-locking member to slide in a extending direction to a positionthat blocks the side impact protection block in the unfolding positionfrom switching to the folding position.

In an embodiment, the self-locking reset member is an elastic memberprovided between the self-locking member and a side impact protectionblock or a backrest on which the self-locking member is located.

In an embodiment, the side impact protection block is pivoted to thebackrest.

In an embodiment, an end of the self-locking member positioned in frontin the extending direction has an inclined surface inclined with respectto the extending direction of the self-locking member, the inclinedsurface of the self-locking member is positioned in front of theself-locking member in a pivotally unfolding direction of the sideimpact protection block, and the self-locking member is in a retractedstate in which the elastic member is elastically deformed when the sideimpact protection block is positioned in the folding position.

In an embodiment, the self-locking member is located on the side impactprotection block, and the self-locking member is pushed by the backrestto be in a retracted state in which the elastic member is elasticallydeformed when the side impact protection block is positioned in thefolding position.

In an embodiment, the backrest is correspondingly provided with a lockfitting part that is locked with the self-locking member when the sideimpact protection block is in the unfolding position, and the backrestis further provided with a stopper for enclosing the lock fitting partand laterally shielding the self-locking member.

In an embodiment, the lock fitting part has a groove structure.

In an embodiment, the self-locking member is positioned in the backrest,the self-locking member is pushed by the side-impact protection block tobe in a retracted state in which the elastic member is elasticallydeformed when the side impact protection block is positioned in thefolding position, and the self-locking member is free from being pushedby the side impact protection block and slides to a position that blocksthe side impact protection block in the unfolding position fromswitching to the folding position when the side impact protection blockis positioned in the unfolding position.

In an embodiment, the backrest is provided with a metal sheet, theself-locking member inserts through the metal sheet, and the elasticmember is provided between the self-locking member and the metal sheet.

In an embodiment, the metal sheet has a “Y” shape.

In an embodiment, the side impact protection block includes a sideimpact protection block body pivoted to the backrest and a blockingmember slidable to a blocking position or an avoidance position on theside impact protection block body, the blocking member projects out ofthe side impact protection block body to be in a blocking position thatblocks against the backrest in a pivotally folding direction when theside impact protection block switches to the unfolding position,meanwhile the self-locking member slides to a position that blocks theside impact protection block in the unfolding position from switching tothe folding position under an action of the elastic member; the blockingmember is retracted into the side impact protection block body to be inthe avoidance position that is free from blocking against the backrestin the pivotally folding direction when the side impact protection blockis in the folding position, and the self-locking member is pushed by thebackrest to be in a retracted state in which the elastic member iselastically deformed.

In an embodiment, the self-locking member is fitted to the blockingmember, and a telescopically slidable direction of the self-lockingmember intersects a sliding direction of the blocking member.

In an embodiment, the side impact protection block further includes ablocking reset member that has a constant tendency to drive the blockingmember to slide to the blocking position.

In an embodiment, the blocking reset member is an elastic memberprovided between the blocking member and the side impact protectionblock body.

In an embodiment, an end of the blocking member positioned in front inan outwardly sliding direction has an inclined surface inclined withrespect to the sliding direction of the blocking member, and theinclined surface of the blocking member is positioned in front of theblocking member in the pivotally unfolding direction of the side impactprotection block.

In an embodiment, the blocking member is a blocking block that exposesfrom the backrest when the side impact protection block is positioned inthe unfolding position.

In an embodiment, the self-locking member is a pin member or a blockmember.

To achieve the above object, the child safety seat of the presentdisclosure includes a seat part, a backrest fitted with the seat part,and the aforementioned side impact protection mechanism.

In an embodiment, the child safety seat of the present disclosurefurther includes a base for detachably fitting and connecting the seatpart.

In contrast to the prior art, since the side impact protection mechanismof the present disclosure further includes a self-locking structurefitted to the side impact protection block or the backrest, theself-locking structure automatically moves to a position that blocks theside impact protection block in the unfolding position from switching tothe folding position when the side impact protection block is switchedfrom the folding position to the unfolding position, and the backrestand/or the side impact protection block shield the self-lockingstructure to block the release operation of the self-locking structureby the operator. Therefore, when the side impact protection block is inthe unfolding position with respect to the backrest for the first time,the side impact protection block in the unfolding position is blockedfrom switching to the unfolding position by the self-locking structure,and the self-locking structure is blocked by the backrest and the sideimpact protection block, thereby blocking the release operation of theself-locking structure by the operator, so that the side impactprotection block cannot be switched to the folding position after thefirst use, thereby effectively preventing the side impact protectionblock from being accidentally folded during the side impact to provide aside impact protection effect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic perspective view of a child safety seat accordingto a first embodiment of the present disclosure when a side impactprotection block is in a folding position.

FIG. 2 is a schematic perspective view of the child safety seataccording to the first embodiment of the present disclosure when theside impact protection block is in an unfolding position.

FIG. 3 is a schematic view showing an internal structure of the childsafety seat in the state shown in FIG. 1 after the side impactprotection mechanism is cut in a vertical plane.

FIG. 4 is a schematic view showing an internal structure of the childsafety seat in the state shown in FIG. 2 after the side impactprotection mechanism is cut in a vertical plane.

FIG. 5 is a schematic perspective view of the side impact protectionmechanism in the child safety seat shown in FIG. 1 when the side impactprotection mechanism is mounted on a portion of a backrest and the sideimpact protection block is in the unfolding position.

FIG. 6 is a schematic perspective view of a child safety seat accordingto a second embodiment of the present disclosure when a side impactprotection block is in a folding position.

FIG. 7 is a schematic perspective view of the child safety seataccording to the second embodiment of the present disclosure when theside impact protection block is in an unfolding position.

FIG. 8 is a schematic perspective view of the child safety seat in thestate shown in FIG. 7 at another angle when a headrest is hidden,showing the side impact protection block on the left side in theunfolding position and the side impact protection block on the rightside in the folding position.

FIG. 9 is a schematic perspective view of the child safety seat in thestate shown in FIG. 7 at a further angle when the headrest is hidden,showing the side impact protection block on the left side in the foldingposition and the side impact protection block on the right side in theunfolding position.

FIG. 10 is a schematic view of an internal structure of the child safetyseat in FIG. 8 after being cut in a horizontal plane.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Embodiments of the present disclosure will now be described withreference to the accompanying drawings, in which like reference numeralsrepresent like elements.

Referring to FIGS. 1 and 2, a child safety seat 100 according to a firstembodiment of the present disclosure includes a seat part 10, a backrest20 fitted and connected to the seat part 10, side impact protectionmechanisms 30 provided on the backrest 20, and a base 40 detachablyfitted and connected to the seat part 10. Specifically, the seat part 10is fixedly fitted with the backrest 20 so that the seat part 10 cannotbe removed from the backrest 20. Of course, the seat part 10 may also beremovably fitted with the backrest 20 according to actual needs, but isnot limited thereto. In addition, the side impact protection mechanisms30 are respectively provided on the left and right sides of the backrest20. That is, the left and right sides of the backrest 20 are bothprovided with the side impact protection mechanism 30, so that a sideimpact protection function can be provided on the left and right sidesof the backrest 20, but is not limited thereto. It will be appreciatedthat the base 40 may be deleted depending on actual needs, but notlimited thereto.

Referring to FIGS. 3 and 4, the side impact protection mechanism 30includes a side impact protection block 31 and a self-locking structure32. The side impact protection block 31 is movably mounted on thebackrest 20, and in an embodiment, it is pivotally engaged with thebackrest 20, so that the side impact protection block 31 is pivotallyunfolded from or folded in the backrest 20. Of course, the side impactprotection block 31 may be slidably mounted on the backrest 20 so thatthe side impact protection block 31 is slidably unfolded from or foldedin the backrest 20 according to actual needs, but not limited thereto.The side impact protection block 31 has a folding position in which itcan be folded inwardly in the backrest 20 (shown in FIGS. 1 and 3) andan unfolding position in which it can be unfolded outwardly from thebackrest 20 (shown in FIGS. 2 and 4)). The self-locking structure 32 isfitted to the side impact protection block 31 such that the self-lockingstructure 32 and the side impact protection block 31 are fittedtogether. Of course, the self-locking structure may be fitted to thebackrest according to actual needs, as will be described morespecifically in the child safety seat of the second embodiment below.The self-locking structure 32 automatically moves to a position thatblocks the side impact protection block 31 in the unfolding positionfrom switching to the folding position when the side impact protectionblock 31 is switched from the folding position as shown in FIG. 3 to theunfolding position as shown in FIG. 4, the state of the self-lockingstructure 32 is shown in FIG. 4, so as to prevent the side impactprotection block 31 in the unfolding position from being switched to thefolding position and folded inward into the backrest 20. The backrest 20and the side impact protection block 31 together shield the self-lockingstructure 32 to block a release operation of the self-locking structure32 by the operator. That is, under a cover of both the backrest 20 andthe side impact protection block 31, the operator cannot perform therelease operation on the self-locking structure 32, so that the sideimpact protection block 31 cannot be switched to the folding positionafter being first used. More specifically, as follows:

As shown in FIGS. 3 and 4, the self-locking structure 32 includes aself-locking member 32 a fitted to the side impact protection block 31and being telescopically slidable and a self-locking reset member 32 bproviding a reset force for a telescopically slidable movement of theself-locking member 32 a. The self-locking reset member 32 b has aconstant tendency to drive the self-locking member 32 a to slide in anextending direction (i.e., a direction indicated by an arrow in theself-locking member 32 a in FIGS. 3 and 4) to a position that blocks theside impact protection block 31 in the unfolding position from switchingto the folding position. Specifically, the self-locking reset member 32b is an elastic member provided between the self-locking member 32 a andthe side impact protection block 31 in which the self-locking member 32a is located, such as, but not limited to, a compression spring, so asto simplify a fitting relationship between the self-locking reset member32 b and the self-locking member 32 a and the side impact protectionblock 31, respectively. Of course, the self-locking reset member 32 bmay also be composed of two magnets which are mutually repulsed bymagnetic forces, i.e., one mounted on the self-locking member 32 a andthe other mounted on the side impact protection block 31, depending onactual needs. In order to facilitate switching the self-locking member32 a from the folding position to the unfolding position smoothly in theside impact protection block 31, in FIG. 3, an end 321 of theself-locking member 32 a positioned in front in the extending direction(i.e., the direction indicated by the arrow in the self-locking member32 a in FIG. 3) has an inclined surface 322 inclined with respect to theextending direction of the self-locking member 32 a (i.e., the directionindicated by the arrow in the self-locking member 32 a in FIG. 3). Theinclined surface 322 of the self-locking member 32 a is positioned infront of the self-locking member 32 a in a pivotally unfolding directionof the side impact protection block 31 (see the direction indicated bythe arrow A in FIG. 3). The self-locking member 32 a is in a retractedstate in which the elastic member is elastically deformed when the sideimpact protection block 31 is positioned in the folding position, asshown in FIG. 3. Specifically, since the self-locking member 32 a ispositioned on the side impact protection block 31, when the side impactprotection block 31 is positioned in the folding position, theself-locking member 32 a is pushed by the backrest 20 to be in aretracted state in which the elastic member is elastically deformed. Inorder that the self-locking member 32 a on the side impact protectionblock 31 is adaptively locked with the backrest 20 when the side impactprotection block 31 is in the unfolding position, so as to effectivelyblock the side impact protection block 31 in the unfolding position fromswitching to the folding position, the backrest 20 is correspondinglyprovided with a lock fitting part 21 that is locked with theself-locking member 32 a when the side impact protection block 31 is inthe unfolding position. In an embodiment, the lock fitting part 21 has agroove structure, but is not limited thereto. The backrest 20 also has astopper 22 for enclosing the lock fitting part 21 and laterallyshielding the self-locking member 32 a to shield the self-locking member32 a by the stopper 22, but is not limited thereto.

As shown in FIGS. 2 to 5, the side impact protection block 31 includes aside impact protection block body 31 a pivoted to the backrest 20 and ablocking member 31 b slidable to a blocking position shown in FIG. 4 orto an avoidance position shown in FIG. 3 on the side impact protectionblock body 31 a. The blocking member 31 b projects out of the sideimpact protection block body 31 a during switching of the side impactprotection block 31 to the unfolding position, so as to be in a blockingposition blocking the backrest 20 in a pivotally folding direction (seean opposite direction indicated by the arrow A in FIG. 4). Meanwhile,the self-locking member 32 a slides to a position that blocks the sideimpact protection block 31 in the unfolding position from switching tothe folding position under an action of the elastic member, as shown inFIG. 4, so that the self-locking member 32 a blocks the side impactprotection block 31 in the unfolding position from switching to thefolding position. The blocking member 31 b is retracted into the sideimpact protection block body 31 a when the side impact protection block31 is in the folding position, and is in an avoidance position that isfree from blocking the backrest 20 in the pivotally folding direction,and the self-locking member 32 a is pushed by the backrest 20 and is ina retracted state in which the elastic member is elastically deformed,as shown in FIG. 3. Therefore, a double locking action against the sideimpact protection block body 32 a can be realized by a cooperation ofthe blocking member 31 b and the self-locking member 32 a, and the sideimpact prevention effect is better. Specifically, the self-lockingmember 32 a is fitted to the blocking member 31 b, and a telescopicallyslidable direction of the self-locking member 32 a (see the directionindicated by the arrow in the self-locking member 32 a in FIGS. 3 and 4and the opposite direction) intersects a sliding direction of theblocking member 31 b (see the direction indicated by the arrow in theblocking member 31 b in FIGS. 3 and 4 and the opposite direction), so asto more effectively block the side impact protection block 31 in theunfolding position from switching to the folding position. Morespecifically, the side impact protection block 31 further includes ablocking reset member 31 c that has a constant tendency to drive theblocking member 31 b to slide to the blocking position. For example, theblocking reset member 31 c is an elastic member provided between theblocking member 31 b and the side impact protection block body 31 a,such as, but not limited to, a compression spring, so as to facilitatefitting between the blocking reset member 31 c and the blocking member31 b and the side impact protection block body 31 a, respectively, butis not limited thereto. Of course, the blocking reset member 31 c mayalso be composed of two magnets which are mutually repulsed by magneticforce according to actual needs, i.e., one magnet is mounted on theblocking member 31 b and the other magnet is mounted on the side impactprotection block body 31 a. It will be understood that when the sideimpact protection block 31 includes the side impact protection blockbody 31 a, the blocking member 31 b, and the self-locking reset member31 c, and the self-locking reset member 31 c is composed of two magnetswhich are mutually repulsed by magnetic force, the magnets mounted onthe side impact protection block 31 are positioned on the blockingmember 31 b and the side impact protection block body 31 a respectively.

In order to facilitate switching the blocking member 31 b from thefolding position to the unfolding position smoothly in the side impactprotection block 31, an end 311 of the blocking member 31 b positionedin front in an outwardly extending direction (i.e., the directionindicated by the arrow in the blocking member 31 b in FIGS. 3 and 4) hasan inclined surface 312 inclined with respect to the sliding directionof the blocking member 31 b (i.e., the direction indicated by the arrowin the blocking member 31 b in FIGS. 3 and 4 and the oppositedirection). The inclined surface 312 of the blocking member 31 b ispositioned in front of the blocking member 31 b in a pivotally unfoldingdirection of the side impact protection block 31 (see the directionindicated by the arrow A in FIGS. 3 and 4). For example, the blockingmember 31 b is a blocking block that exposes from the backrest 20 whenthe side impact protection block 31 is in the unfolding position, andthe self-locking member 32 a is a block-shaped member, but is notlimited thereto.

It will be understood that when the side impact protection block 31 isnot designed to include the side impact protection block body 31 a, theblocking member 31 b, and the blocking reset member 31 c, i.e., the sideimpact protection block 31 at this time is an integral structure, theself-locking member 32 a provides a single locking blocking effect tothe side impact protection block 31. When the side impact protectionblock 31 is designed to include the side impact protection block body 31a, the blocking member 31 b, and the blocking reset member 31 c, theblocking member 31 b and the self-locking member 32 a provides a doublelocking blocking effect to the side impact protection block body 31 a.

With reference to FIGS. 1 to 5, an unfolding process of the side impactprotection mechanism on the left side of the child safety seat accordingto the first embodiment of the present disclosure will be described. Asshown in FIGS. 1 and 3, the side impact protection block 31 is in thefolding position in which the side impact protection block 31 is inwardfolding into the backrest 20 when the side impact protection block 31 onthe left side of the side impact protection mechanism 30 is not used forthe first time, so that the self-locking member 32 a is pushed by thebackrest 20 to be in a retracted state in which the self-locking resetmember 32 b is elastically deformed (for example, but not limited to acompression deformation), and the blocking member 31 b of the sideimpact protection block 31 is in the avoidance position so that theblocking reset member 31 c is elastically deformed (for example, but notlimited to the compression deformation thereof), as shown in FIG. 3.Next, in a process of pivotally unfolding the side impact protectionblock body 31 a to the unfolding position in the direction indicated bythe arrow A in FIG. 3, the blocking member 31 b slides to the blockingposition under an action of a reset force provided by the blocking resetmember 31 c, so that the blocking member 31 b in the blocking positionis blocked against the backrest 20 in the pivotally folding direction toblock the side impact protection block body 31 a in the unfoldingposition from switching to the folding position by the blocking member31 b. Meanwhile, in a process that the blocking member 31 b slides tothe blocking position under the action of the reset force provided bythe blocking reset member 31 c, the self-locking member 32 a slides to aposition that is locked with the lock fitting part 21 under the actionof the reset force provided by the self-locking reset member 32 b, so asto block the operator from pressing the blocking member 31 b in theblocking position to be switched to the avoidance position, as shown inFIG. 4, so that the side impact protection block 31 can no longer beretracted into the backrest 20 after the first use.

Referring to FIGS. 6 to 10, a structure of a child safety seat accordingto a second embodiment of the present disclosure is basically the sameas that of the child safety seat according to the first embodiment,except that the backrest and the side impact protection mechanismthereof are as follows:

(1) In the child safety seat 100′ of the second embodiment, theself-locking member 32 a′ of the self-locking structure 32′ in the sideimpact protection mechanism 30′ is a pin member, while in the childsafety seat 100 of the first embodiment, the self-locking member 32 a ofthe self-locking structure 32 in the side impact protection mechanism 30is a block-shaped member.

(2) In the child safety seat 100′ of the second embodiment, theself-locking member 32 a′ is positioned in the backrest 20′, and theself-locking structure 32′ is shielded by the backrest 20′.Correspondingly, the self-locking member 32 a′ is pushed by the sideimpact protection block 31 to be in a retracted state in which theelastic member is elastically deformed when the side impact protectionblock 31 is positioned in the folding position, as shown in an enlargedpart in FIG. 9, or an enlarged part at the top in FIG. 10. Theself-locking member 32 a′ is free from being pushed by the side impactprotection block 31 and slides to a position that blocks the side impactprotection block 31 in the unfolding position from switching to thefolding position when the side impact protection block 31 is in theunfolding position, as shown in the enlarged part of FIG. 8, or anenlarged part at the bottom in FIG. 10. In an embodiment, in theenlarged part at the top in FIG. 10, when the side impact protectionblock 31 is in the folding position, the self-locking member 32 a′ ispushed by an upper side wall 314 of the side impact protection block 31to be in the retracted state in which the elastic member is elasticallydeformed. In the enlarged part at the bottom in FIG. 10, when the sideimpact protection block 31 is positioned in the unfolding position, theself-locking member 32 a′ is free from being pushed by the upper sidewall 314 of the side impact protection block 31 and slides to a positionthat blocks the side impact protection block 31 in the unfoldingposition to the folding position. The self-locking member 32 a′ in thisposition is positioned rearward of an inner side wall 315 of the sideimpact protection block 31 in the pivotally unfolding direction and isblocked against the inner side wall 315, thereby blocking the sideimpact protection block 31 in the unfolding position from switching tothe folding position. While in the child safety seat 100 of the firstembodiment, the self-locking member 32 a is positioned on the sideimpact protection block 31, specifically on the blocking member 31 b ofthe side impact protection block 31. Therefore, when the side impactprotection block 31 is positioned in the folding position, theself-locking member 32 a is pushed by the backrest 20 and thus is in aretracted state that the elastic member is elastically deformed. Whenthe side impact protection block 31 is in the unfolding position, theself-locking member 32 a locks with the lock fitting part 21 provided inthe backrest 20.

(3) In the child safety seat 100′ of the second embodiment, since theself-locking member 32 a′ blocks against the inner side wall 315 of theside impact protection block 31 when the side impact protection block 31is in the unfolding position, the self-locking member 32 a′ is notprovided with the inclined surface 322 of the self-locking member 32 ain the child safety seat 100 of the first embodiment, and the backrest20′ is not provided with the lock fitting part 21 and the stopper 22.

(4) In the child safety seat 100′ of the second embodiment, the backrest20′ is provided with a metal sheet 50. The self-locking member 32 a isinserted through the metal sheet 50, and the elastic member is providedbetween the self-locking member 32 a and the metal sheet 50. Forexample, the metal sheet 50 has a “Y” shape, the self-locking members 32a′ are respectively inserted into two branch ends 51 on the metal sheet50, and the self-locking members 32 a′ on each branch end 52 correspondto a self-locking reset member 32 b. While in the child safety seat 100of the first embodiment, the backrest 20 is not provided with a metalsheet.

In addition to the differences described above, other parts are the sameas the child safety seat 100 of the first embodiment, and will not bedescribed herein again.

With reference to FIG. 6, FIG. 7, FIG. 8, and FIG. 10, an unfoldingprinciple of the side impact protection mechanism on the left side ofthe child safety seat according to the second embodiment of the presentdisclosure will be described as follows:

As shown in FIG. 6, the side impact protection block 31 is in thefolding position in which the side impact protection block 31 is inwardfolding into the backrest 20′ when the side impact protection block 31on the left side of the side impact protection mechanism 30′ is not usedfor the first time, so that the self-locking member 32 a is pushed bythe side impact protection block body 31 a (specifically, it is pushedby the upper side wall 314 of the side impact protection block body 31a) to be in a retracted state in which the self-locking reset member 32b is elastically deformed (for example, but not limited to a compressiondeformation), and the blocking member 31 b of the side impact protectionblock 31 is in the avoidance position so that the blocking reset member31 c is elastically deformed (for example, but not limited to thecompression deformation thereof). Next, in a process of pivotallyunfolding the side impact protection block body 31 a to the unfoldingposition in the direction indicated by the arrow A in FIG. 6, theblocking member 31 b slides to the blocking position under an action ofa reset force provided by the blocking reset member 31 c, so that theblocking member 31 b in the blocking position is blocked against thebackrest 20 in the pivotally folding direction to block the side impactprotection block body 31 a in the unfolding position from switching tothe folding position by the blocking member 31 b. Meanwhile, when theside impact protection block 31 a is switched to the unfold position,since the upper side wall 314 of the side impact protection block body31 a is free from pushing the self-locking member 32 a′, theself-locking member 32 a′ slides to the rear of the inner side wall 315of the side impact protection block body 31 a under the action of thereset force provided by the self-locking reset member 32 b. Thus, theself-locking member 32 a′ is blocked against the inner side wall 315 inthe pivotally folding direction. Although the operator can push theblocking member 31 b in the blocking position to switch to the avoidanceposition, the self-locking member 32 a′ is blocked against the innerside wall 315 in the pivotally folding direction, thus the side impactprotection block 31 cannot be retracted into the backrest 20 after thefirst use.

In contrast to the prior art, since the side impact protection mechanism30 (30′) of the present disclosure further includes a self-lockingstructure 32 (32′) fitted to the side impact protection block 31 or thebackrest 20 (20′), the self-locking structure (32′) automatically movesto a position that blocks the side impact protection block 31 in theunfolding position from switching to the folding position when the sideimpact protection block (31) is switched from the folding position tothe unfolding position, and the backrest 20 (20′) and/or the side impactprotection block 31 shield the self-locking structure 32 (32′) to blockthe release operation of the self-locking structure (32′) by theoperator. Therefore, when the side impact protection block 31 is in theunfolding position with respect to the backrest for the first time, theside impact protection block 31 in the unfolding position is blockedfrom switching to the unfolding position by the self-locking structure32 (32′), and the self-locking structure 32 (32′) is blocked by thebackrest 20 (20′) and the side impact protection block 31, therebyblocking the release operation of the self-locking structure 32 (32′) bythe operator, so that the side impact protection block 31 cannot beswitched to the folding position after the first use, therebyeffectively preventing that the side impact protection block 31 does notprovide a side impact protection effect due to being accidentally foldedduring the side impact.

It should be noted that the aforementioned left and right sides means anorientation when the user sits in the child safety seat 100 (100′) ofthe present disclosure, and the user's back faces the backrest 20 (20′).In this case, an orientation of the user's left hand is the left side ofthe child safety seat 100 (100′) and an orientation of the user's righthand is the right side of the child safety seat 100 (100′).

The above disclosed are only the preferred embodiments of the presentdisclosure. Of course, the scope of rights of the present disclosurecannot be limited by this. Therefore, equivalent changes made accordingto the scope of the patent application of the present disclosure stillfall within the scope of the present disclosure.

What is claimed is:
 1. A side impact protection mechanism provided at abackrest of a child safety seat and comprising a side impact protectionblock movably fitted to the backrest and having a folding position inwhich the side impact protection block is inwardly folded in thebackrest and an unfolding position in which the side impact protectionblock is outwardly unfolded from the backrest, wherein the side impactprotection mechanism further comprises a self-locking structure fittedto the side impact protection block or the backrest, the self-lockingstructure automatically moves to a position that blocks the side impactprotection block in the unfolding position from switching to the foldingposition when the side impact protection block is switched from thefolding position to the unfolding position, and the backrest and theside impact protection block shields the self-locking structure to blocka release operation of the self-locking structure by an operator.
 2. Theside impact protection mechanism of claim 1, wherein the self-lockingstructure comprises a self-locking member fitted to the backrest or theside impact protection block and being telescopically slidable, and aself-locking reset member providing a reset force for a telescopicallyslidable movement of the self-locking member, the self-locking resetmember has a constant tendency to drive the self-locking member to slidein a extending direction to a position that blocks the side impactprotection block in the unfolding position from switching to the foldingposition.
 3. The side impact protection mechanism of claim 2, whereinthe self-locking reset member is an elastic member provided between theself-locking member and the side impact protection block or the backreston which the self-locking member is located.
 4. The side impactprotection mechanism of claim 3, wherein the side impact protectionblock is pivoted to the backrest.
 5. The side impact protectionmechanism of claim 4, wherein an end of the self-locking memberpositioned in front in the extending direction has an inclined surfaceinclined with respect to the extending direction of the self-lockingmember, the inclined surface of the self-locking member is positioned infront of the self-locking member in a pivotally unfolding direction ofthe side impact protection block, and the self-locking member is in aretracted state in which the elastic member is elastically deformed whenthe side impact protection block is positioned in the folding position.6. The side impact protection mechanism of claim 5, wherein theself-locking member is located on the side impact protection block, andthe self-locking member is pushed by the backrest to be in a retractedstate in which the elastic member is elastically deformed when the sideimpact protection block is positioned in the folding position.
 7. Theside impact protection mechanism of claim 5, wherein the backrest iscorrespondingly provided with a lock fitting part that is locked withthe self-locking member when the side impact protection block is in theunfolding position, and the backrest is further provided with a stopperfor enclosing the lock fitting part and laterally shielding theself-locking member.
 8. The side impact protection mechanism of claim 7,wherein the lock fitting part has a groove structure.
 9. The side impactprotection mechanism of claim 4, wherein the self-locking member ispositioned in the backrest, the self-locking member is pushed by theside-impact protection block to be in a retracted state in which theelastic member is elastically deformed when the side impact protectionblock is positioned in the folding position, and the self-locking memberis free from being pushed by the side impact protection block and slidesto a position that blocks the side impact protection block in theunfolding position from switching to the folding position when the sideimpact protection block is positioned in the unfolding position.
 10. Theside impact protection mechanism of claim 9, wherein the backrest isprovided with a metal sheet, the self-locking member inserts through themetal sheet, and the elastic member is provided between the self-lockingmember and the metal sheet.
 11. The side impact protection mechanism ofclaim 10, wherein the metal sheet has a “Y” shape.
 12. The side impactprotection mechanism of claim 4, wherein the side impact protectionblock comprises a side impact protection block body pivoted to thebackrest and a blocking member slidable to a blocking position or anavoidance position on the side impact protection block body, theblocking member projects out of the side impact protection block body tobe in a blocking position that blocks against the backrest in apivotally folding direction when the side impact protection blockswitches to the unfolding position, meanwhile the self-locking memberslides to a position that blocks the side impact protection block in theunfolding position from switching to the folding position under anaction of the elastic member; the blocking member is retracted into theside impact protection block body to be in the avoidance position thatis free from blocking against the backrest in the pivotally foldingdirection when the side impact protection block is in the foldingposition, and the self-locking member is pushed by the backrest to be ina retracted state in which the elastic member is elastically deformed.13. The side impact protection mechanism of claim 12, wherein theself-locking member is fitted to the blocking member, and atelescopically slidable direction of the self-locking member intersectsa sliding direction of the blocking member.
 14. The side impactprotection mechanism of claim 12, wherein the side impact protectionblock further comprises a blocking reset member that has a constanttendency to drive the blocking member to slide to the blocking position.15. The side impact protection mechanism of claim 14, wherein theblocking reset member is an elastic member provided between the blockingmember and the side impact protection block body.
 16. The side impactprotection mechanism of claim 12, wherein an end of the blocking memberpositioned in front in an outwardly sliding direction has an inclinedsurface inclined with respect to the sliding direction of the blockingmember, and the inclined surface of the blocking member is positioned infront of the blocking member in the pivotally unfolding direction of theside impact protection block.
 17. The side impact protection mechanismof claim 12, wherein the blocking member is a blocking block thatexposes from the backrest when the side impact protection block ispositioned in the unfolding position.
 18. The side impact protectionmechanism of claim 2, wherein the self-locking member is a pin member ora block member.
 19. A child safety seat comprising a seat part and abackrest fitted with the seat part, wherein the child safety seatfurther comprises the side impact protection mechanism according toclaim
 1. 20. The child safety seat of claim 19, further comprising abase for detachably fitting and connecting the seat part.